The system (1) has a detection device (60) having radio sensor (61) which is arranged in the flow path of system gas. The radio sensor is provided to detect the sparks (F) in flow path and to output a radio detection signal to control device (50). The control device is adapted to output an extinguishing powder output signal to the dry powder dispenser (70), in response to radio detection signal. The dry powder dispenser is adjacent to the radio sensor and is connected to flow path, in response to the output signal by which extinguishing powder (P) is output into the flow path inside.